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use std::env;
use std::error::Error;
use std::fs;
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
println!("config: {:?}", config);
let contents = fs::read_to_string(config.file_name)?;
let vecs = if config.case_sensitive {
search(&config.query_word, &contents)
} else {
search_no_case_sensitive(&config.query_word, &contents)
};
for line in &vecs {
println!("line:{}", line);
}
println!("vecs:{:?}", vecs);
Ok(())
}
#[derive(Debug)]
pub struct Config {
query_word: String,
file_name: String,
case_sensitive: bool,
}
impl Config {
pub fn new(mut args: env::Args) -> Result<Config, &'static str> {
args.next();
let query_word = match args.next() {
Some(v) => v,
None => return Err("Didn't get a query string"),
};
let file_name = match args.next() {
Some(v) => v,
None => return Err("Didn't get a file name"),
};
let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
println!("case_sensitive:{}", case_sensitive);
Ok(Config {
query_word,
file_name,
case_sensitive,
})
}
}
fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
contents
.lines()
.filter(|line| line.contains(query))
.collect()
}
fn search_no_case_sensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let mut vecs = Vec::new();
let query = query.to_lowercase();
for line in contents.lines() {
if line.to_lowercase().contains(&query) {
vecs.push(line);
}
}
vecs
}
#[cfg(test)]
mod tests {
#[test]
fn test() {
let query = "Duct";
let contents = "\
Rust:
safe, fast, productive.
Pick three";
assert_eq!(
vec!["safe, fast, productive."],
super::search(query, contents)
);
}
#[test]
fn search_no_case_sensitive() {
let query = "Duct";
let contents = "\
Rust:
safe, fast, productive.
Ductory";
assert_eq!(
vec!["Ductory"],
super::search_no_case_sensitive(query, contents)
);
}
}